Validation of an instrument for injury data collection in strength training

Purpose: To provide for the basis for collecting strength training data using a rigorously validated injury report form. Methods: A group of specialist designed a questionnaire of 45 item grouped into 4 dimensions. Six stages were used to assess face, content, and criterion validity of the weight training injury report form. A 13 members panel assessed the form for face validity, and an expert panel assessed it for content and criterion validity. Panel members were consulted until consensus was reached. A yardstick developed by an expert panel using Intraclass correlation technique was used to assess the reability of the form. Test-retest reliability was assessed with the intraclass correlation coefficient (ICC).The strength training injury report form was developed, and the face, content, and criterion validity successfully assessed. A six step protocol to create a yardstick was also developed to assist in the validation process. Both inter-rater and intra rater reliability results indicated a 98% agreement. Inter-rater reliability agreement of 98% for three injuries. Results: The Cronbach?s alpha of the questionnaire was 0.944 (pmenor que0.01) and the ICC of the entire questionnaire was 0.894 (pmenor que0.01). Conclusion: The questionnaire gathers together enough psychometric properties to be considered a valid and reliable tool for register injury data in strength training, and providing researchers with a basis for future studies in this area. Key Words: data collection; validation; injury prevention; strength training

Quantitative assessment based on kinematic measures of functional impairments during upper extremity movements: a review

Quantitative measures of human movement quality are important for discriminating healthy and pathological conditions and for expressing the outcomes and clinically important changes in subjects' functional state. However the most frequently used instruments for the upper extremity functional assessment are clinical scales, that previously have been standardized and validated, but have a high subjective component depending on the observer who scores the test. But they are not enough to assess motor strategies used during movements, and their use in combination with other more objective measures is necessary. The objective of the present review is to provide an overview on objective metrics found in literature with the aim of quantifying the upper extremity performance during functional tasks, regardless of the equipment or system used for registering kinematic data.

Effects of different swimming race constraints on turning movements

The aim of this study was to investigate the effects of different swimming race constraints on the evolution of turn parameters. One hundred and fifty-eight national and regional level 200-m (meters) male swimming performances were video-analyzed using the individualized-distance model in the Open Comunidad de Madrid tournament. Turn (p < .001, ES = 0.36) and underwater distances (p < .001, ES = 0.38) as well as turn velocity (p < .001, ES = 0.69) significantly dropped throughout the race, although stroke velocity and underwater velocity were maintained in the last lap of the race (p > .05). Higher expertise swimmers obtained faster average velocities and longer distances in all the turn phases (p < .001, ES = 0.59), except the approach distance. In addition, national level swimmers showed the ability to maintain most of the turn parameters throughout the race, which assisted them in improving average velocity at the end of races. Therefore, the variations in the turning movements of a swimming race were expertise-related and focused on optimizing average velocity. Turning skills should be included in the swimming race action plan.

Análisis de la marcha: evaluación de un exoesqueleto aplicado a la marcha asistida

La marcha humana es el mecanismo de locomoción por el cual el cuerpo humano se traslada en línea recta gracias a una serie de movimientos coordinados de la pelvis y de las articulaciones del miembro inferior. Frecuentemente se encuentra influenciada por factores biomecánicos, anatómicos o patologías del sistema neuromusculoesquelético que modifican la forma de caminar de cada individuo. La lesión de médula espinal es una de las patologías que afectan el desarrollo normal de los patrones de la marcha por alteración de la movilidad, de la sensibilidad o del sistema nervioso autónomo. Aunque la lesión medular afecta otras funciones, además de la pérdida de función motora y sensorial, la recuperación de la capacidad de caminar es la mayor prioridad identificada por los pacientes durante la rehabilitación. Por ello, el desarrollo de dispositivos que faciliten la rehabilitación o compensación de la marcha es uno de los principales objetivos de diferentes grupos de investigación y empresas. En el contexto del proyecto Hybrid Technological Platform for Rehabilitation, Functional Compensation and Training of Gait in Spinal Cord Injury Patients se ha desarrollado un dispositivo que combina una órtesis activa (exoesqueleto) y un andador motorizado. Este sistema, como otros dispositivos, tiene el movimiento humano como estándar de referencia, no obstante no se evalúa de manera habitual, cómo es el patrón de la marcha reproducido y su similitud o diferencias con la marcha humana, o las modificaciones o adaptaciones en la interacción con el cuerpo del paciente. El presente estudio trata de examinar las características de la marcha normal en diversos grupos de población, y las diferencias con el patrón de marcha lenta. Finalmente, se pretende evaluar qué modificaciones y adaptaciones sufre el patrón de marcha lenta teórico al ser reproducido por el exoesqueleto. La presente investigación consiste en un estudio cuantitativo transversal desarrollado en dos etapas: estudio 1 y estudio 2. En el estudio 1 se analizó el patrón de la marcha a velocidad libremente seleccionada (normal) y el patrón de la marcha a velocidad lenta (0.25m/s) en 62 sujetos distribuidos en grupos considerando el sexo y los percentiles 25, 50 y 75 de estatura de la población española. Durante el estudio 2 se analizó el patrón de la marcha lenta reproducido por el dispositivo Hybrid a diferentes porcentajes de peso corporal (30%, 50% y 70%) en diez sujetos seleccionados aleatoriamente de la muestra del estudio 1. En ambos estudios se obtuvieron variables espacio-temporales y cinemáticas mediante un sistema de captura de movimiento con 6 cámaras distribuidas a lo largo de un pasillo de marcha. Se calcularon las medias, las desviaciones estándar y el 95% de intervalo de confianza, y el nivel alfa de significación se estableció en α=0.05 para todas las pruebas estadísticas. Las principales diferencias en el patrón normal de la marcha se encontraron en los parámetros cinemáticos de hombres y mujeres, aunque también se presentaron diferencias entre los grupos en función de la estatura. Las mujeres mostraron mayor flexión de cadera y rodilla, y mayor extensión de tobillo que los hombres durante el ciclo normal, aunque la basculación lateral de la pelvis, mayor en las mujeres, y el desplazamiento lateral del centro de gravedad, mayor en los hombres, fueron los parámetros identificados como principales discriminantes entre sexos. La disminución de la velocidad de la marcha mostró similares adaptaciones y modificaciones en hombres y en mujeres, presentándose un aumento de la fase de apoyo y una disminución de la fase de oscilación, un retraso de los máximos y mínimos de flexoextensión de cadera, rodilla y tobillo, y una disminución del rango articular en las tres articulaciones. Asimismo, la basculación lateral de la pelvis y el movimiento vertical del centro de gravedad disminuyeron, mientras que el movimiento lateral del centro de gravedad y el ancho de paso aumentaron. Durante la evaluación del patrón de la marcha reproducido por el exoesqueleto se observó que las tres articulaciones del miembro inferior disminuían el rango de movimiento por la falta de fuerza de los motores para contrarrestar el peso corporal, incluso con un 70% de descarga de peso. Además, la transferencia de peso se encontró limitada por la falta de movimiento de la pelvis en el plano frontal y se sustituyó por un aumento de la inclinación del tronco y, por tanto, del movimiento lateral del centro de gravedad. Este hecho, junto al aumento del desplazamiento vertical del centro de gravedad, hizo del patrón de la marcha reproducido por el exoesqueleto un movimiento poco eficiente. En conclusión, se establecen patrones de marcha normal diferenciados por sexos, siendo la basculación lateral de la pelvis y el movimiento lateral del centro de gravedad los parámetros discriminantes más característicos entre sexos. Comparando la marcha a velocidad libremente seleccionada y la velocidad lenta, se concluye que ambos sexos utilizan estrategias similares para adaptar el patrón de la marcha a una velocidad lenta y se mantienen las características diferenciadoras entre hombres y mujeres. En relación a la evaluación del dispositivo Hybrid, se deduce que la falta de movimiento lateral de la pelvis condiciona la transferencia de peso y el aumento del rango de movimiento del centro de gravedad y, en consecuencia, tiene como resultado un patrón de la marcha poco eficiente. Este patrón no resultaría indicado para los procesos de rehabilitación o recuperación de la marcha, aunque podría considerarse adecuado para la compensación funcional de la bipedestación y la locomoción. ABSTRACT The human walking is a means of moving body forward using a repetitious and coordinated sequence of pelvis and lower limb motions. It is frequently influenced by biomechanical and anatomical factors or by musculoskeletal pathologies which modify the way of walking. The spinal injury is one of those pathologies which affect the normal pattern of walking, due to the alteration of the mobility, the sensory or the autonomic nervous system. Although the spinal injury affects many other body functions, apart from the motor and sensory ones, the main priority for patients is to recover the ability of walking. Consequently, the main objective of many research groups and private companies is the development of rehabilitation and compensation devices for walking. In this context, the Hybrid Technological Platform for Rehabilitation, Functional Compensation and Training of Gait in Spinal Cord Injury Patients project has developed a device which integrates an exoskeleton and a motorized smart walker. This system, as other similar devices, has the human movement as standard reference. Nevertheless, these devices are not usually evaluated on the way they reproduce the normal human pattern or on the modifications and in the interactions with the patient’s body. The aim of the present study is to examine the normal walking characteristics, to analyze the differences between self-selected and low speed walking patterns, and to evaluate the modifications and adaptations of walking pattern when it is reproduced by the exoskeleton. The present research is a quantitative cross-sectional study carried out in two phases: study 1 and study 2. During the study 1, the self-selected and the low speed (0.25m/s) walking patterns were analyzed in sixty-two people distributed in groups, according to sex and 25th, 50th and 75th percentiles of height for Spanish population. The study 2 analyzed the low speed walking pattern reproduced by the Hybrid system in three conditions: 30%, 50% and 70% of body weight support. To do this, ten subjects were randomly selected and analyzed from the people of study 1. An optoelectronic system with six cameras was used to obtain spatial, temporal and kinematic parameters in both studies. Means, standard deviations and 95% confidence intervals of the study were calculated. The alpha level of significance was set at α=0.05 for all statistical tests. The main differences in normal gait pattern were found in kinematic parameters between men and women. The hip and the knee were more flexed and the ankle plantar flexion was higher in women than in men during normal gait cycle. Although the greater pelvic obliquity of women and the higher lateral movement of center of gravity of men were the most relevant discriminators between male and female gait patterns. Comparing self-selected and low speed walking patterns, both sexes showed similar adaptations and modifications. At low speed walking, men and women increased the stance phase ratio and decreased the swing phase ratio. The maximum and minimum peak flexion of hip, knee and ankle appeared after and the range of motion of them decreased during low speed walking. Furthermore, the pelvic obliquity and the vertical movement of the center of gravity decreased, whereas the lateral movement of center of gravity and step width increased. Evaluating the gait pattern reproduced by the exoskeleton, a decrease of lower limb range of motion was observed. This was probably due to the lack of strength of the engines, which were not able to control the body weight, even with the 70% supported. Moreover, the weight transfer from one limb to the contralateral side was restricted due to the lack of pelvis obliquity. This movement deficiency was replaced by the lateral torso sway and, consequently, the increase of lateral movement of the center of gravity. This fact, as well as the increase of the vertical displacement of the center of gravity, made inefficient the gait pattern reproduced by the exoskeleton. In conclusion, different gait patterns of both sexes have been determined, being pelvis obliquity and lateral movement of center of gravity the most relevant discriminators between male and female gait patterns. Comparing self-selected and low speed walking patterns, it was concluded that both sexes use similar strategies for adapting the gait pattern to a low speed, and therefore, the differentiating characteristics of normal gait are maintained. Regarding the Hybrid system evaluation, it was determined that the gait pattern reproduced by the exoskeleton is inefficient. This was due to the lack of pelvis obliquity and the increase of the center of gravity displacement. Consequently, whereas the walking pattern reproduced by the exoskeleton would not be appropriated for the rehabilitation process, it could be considered suitable for functional compensation of walking and standing.

Exploración y evaluación de mecanismos para la captura de la posición y postura de personas en entornos reales

El presente trabajo consiste en el estudio de la viabilidad en el uso de tres posibles opciones orientadas a la captura de la posición y la postura de personas en entornos reales, así como el diseño e implementación de un prototipo de captura en cada uno de ellos. También se incluye una comparativa con el fin de destacar los pros y los contras de cada solución. Una de las alternativas para llevarlo a cabo consiste en un sistema de tracking óptico por infrarrojos de alta calidad y precisión, como es Optitrack; la segunda se basa en una solución de bajo coste como es el periférico Kinect de Microsoft y la tercera consiste en la combinación de ambos dispositivos para encontrar un equilibrio entre precisión y economía, tomando los puntos fuertes de cada uno para contrarrestar sus debilidades. Uno de los puntos importantes del trabajo es que el uso de los prototipos de captura está orientado a entornos de trabajo reales (en concreto en la captura de los movimientos del personal que trabaja en un quirófano), así que han sido necesarias pruebas para minimizar el efecto de las fuentes de luz en los sistemas de infrarrojos, el estudio de los dispositivos para determinar el número de personas que son capaces de capturar a la vez sin que esto afecte a su rendimiento y el nivel de invasión de los dispositivos en los trabajadores (marcadores para el tracking), además de los mecanismos apropiados para minimizar el impacto de las oclusiones utilizando métodos de interpolación y ayudándose del conocimiento del contexto, las restricciones de movimiento del cuerpo humano y la evolución en el tiempo. Se han desarrollado conocimientos en el funcionamiento y configuración dispositivos como el sistema de captura Optitrack de Natural Point y el sistema de detección de movimiento Kinect desarrollado por Microsoft. También se ha aprendido el funcionamiento del entorno de desarrollo y motor de videojuegos multiplataforma homónimos Unity y del lenguaje de programación C# que utiliza dicho entorno para sus scripts de control, así como los protocolos de comunicación entre los distintos sistemas que componen los prototipos como son VRPN y NatNet.---ABSTRACT---This project is about a viability study in the use of three possible options, oriented towards the capture of the position and view of people in a real environment, as well as the design and implementation of a capturing prototype in each of them. A comparative study is also included, in order to emphasise the pros and cons of each solution. One of the alternatives consists of an optical tracking system via high quality and precision infrareds, like Optitrack; the second is based on a low cost solution, such as Microsoft’s Kinect peripheral, and the third consists on a combination of both devices to find a balance between precision and price, taking the strong points of each of the mechanisms to make up for the weaknesses. One of the important parts of this project is that the use of the capturing prototypes is directed towards real life work situations (specifically towards the capturing of the movements of surgery personnel), so various tests have been necessary in order to minimize the effect of light sources in infrared systems, the study of the devices to determine the number of people that they are capable of capturing simultaneously without affecting their performance and the invasion level of the devices towards the workers (tracking markers), as well as the mechanisms adopted to minimize the impact of the occlusions using interpolation methods and with help of the knowledge of the surroundings, the human movement restrictions and the passing of time. Knowledge has been developed on the functioning and configuration of the devices such as Natural Point’s Optitrak capturing system, and the Kinect movement detection system developed by Microsoft. We have also learned about the operating of the development and incentive environment of multiplatform videogames of namesake Unity and of C# programming language, which uses said environment for its control scripts, as well as communication protocols between the different systems that make up prototypes like VRPN and NatNet.

AGORA EU, CORPO, SINTO, PENSO E EVIDENCIO – A PRESENÇA DO DUALISMO E RACIONALISMO NA EDUCAÇÃO

Esta pesquisa tem como foco central o estudo sobre a situação do aspecto corporal e do movimento humano no sistema educacional brasileiro. Para desenvolver esta temática foram utilizados três grandes pilares de diferentes áreas do conhecimento, mas articuladas entre si; elas são: Filosofia, Educação Física e Educação. Partindo de uma concepção filosófica, foram analisados diversos temas em relação ao corpo e à situação deste em relação às estruturas educacionais existentes, utilizando especialmente a condição atual da Educação Física escolar como suporte para realizar esta análise. Tendo como hipótese inicial que o dualismo e o racionalismo representam a base estruturante do âmbito educacional e que, a partir disto, ocorre uma crescente diminuição na importância do corpo e do seu movimento nas estruturas educacionais, foram tecidas reflexões e discussões subseqüentes durante o desenvolvimento do trabalho. Delineada por levantamento bibliográfico e documental, contendo descrição, exploração e análises dos documentos oficiais da Educação brasileira e respaldada por autores de referência das áreas citadas, a pesquisa apresenta um desenvolvimento de idéias que convergem tanto para a superação da visão dualista humana (que divide em pólos opostos e intransponíveis corpo e alma, corpo e mente), como para um sistema que preconiza o pleno desenvolvimento humano.(AU)

AGORA EU, CORPO, SINTO, PENSO E EVIDENCIO – A PRESENÇA DO DUALISMO E RACIONALISMO NA EDUCAÇÃO

Esta pesquisa tem como foco central o estudo sobre a situação do aspecto corporal e do movimento humano no sistema educacional brasileiro. Para desenvolver esta temática foram utilizados três grandes pilares de diferentes áreas do conhecimento, mas articuladas entre si; elas são: Filosofia, Educação Física e Educação. Partindo de uma concepção filosófica, foram analisados diversos temas em relação ao corpo e à situação deste em relação às estruturas educacionais existentes, utilizando especialmente a condição atual da Educação Física escolar como suporte para realizar esta análise. Tendo como hipótese inicial que o dualismo e o racionalismo representam a base estruturante do âmbito educacional e que, a partir disto, ocorre uma crescente diminuição na importância do corpo e do seu movimento nas estruturas educacionais, foram tecidas reflexões e discussões subseqüentes durante o desenvolvimento do trabalho. Delineada por levantamento bibliográfico e documental, contendo descrição, exploração e análises dos documentos oficiais da Educação brasileira e respaldada por autores de referência das áreas citadas, a pesquisa apresenta um desenvolvimento de idéias que convergem tanto para a superação da visão dualista humana (que divide em pólos opostos e intransponíveis corpo e alma, corpo e mente), como para um sistema que preconiza o pleno desenvolvimento humano.(AU)

Young people's socialisation into sport: A case study of an athletics club

This paper explores young people's (9 to 15 years old) early socialisation into sport. We draw on data from an 18-month-long ethnography of the junior section of an athletics club in England, using field notes, interviews and a psychometric questionnaire. We begin by noting a trend towards increasing numbers of younger children participating in adult-organised, community-based sport. Within this context, we investigate the extent to which Siedentop's [(1995) Junior Sport and the evolution of sport cultures, Keynote presentation to the Junior Sport Forum, Auckland, New Zealand] three main goals for young people's participation in sport, i.e. the educative, public health and elite development, are met in specific, local junior sport settings such as Forest Athletics Club (FAC). We report that most of the young people participating in the Introductory Groups at FAC begin their socialisation into sport by 'sampling' a range of sports and other activities that are available to them. We note the key features of the sampling phase for these young people, including their involvement in sports and other activities in addition to athletics, their reasons for participation, the place of competition and the importance of friendship. We report that FAC created a climate for the Samplers, intentionally or not, conducive to the development of Siedentop's educative goal, and to a lesser extent the public health and elite development goals. In concluding, we note the implications of the study for community-based programmes run by clubs.

Listening to young people's voices: Youth sports leaders' advice on facilitating participation in sport

This article reports on a study that accepts the proposal that we listento the voices of young people in relation to sport and physical recreation.The study sought the advice of young sports leaders on what can be done to facilitate young people’s involvement in sport. The study used group interviews (Nominal Group Technique) with over 600 14–18-year-olds toelicit responses to a single question, ‘What can be done to help young people participate in sport?’ This article focuses on young people’s views on issues to do with climate and conditions. We argue that, while their advice offers support for some current initiatives in youth sport, it also provides new insights and challenges and suggests a reordering of existing priorities for youth sport and leisure provision.

Social positioning and the construction of a youth sports club

This article uses the concept of social positioning to explore the construction of a youth sports club by young people, their parents and coaches. The year-long ethnography of Forest Athletics Club (FAC) identified two athlete positions of Samplers and Beginning Specializers. Four parents’ positions were identified, those of Non-Attenders, Spectators, Helpers and Committed Members. One coach position was the Committed Volunteer. Each of these positions was interdependent. Particular expectations, practices and values were attached to these positions. It is argued that the club operates according to multiple agendas and that FAC is a complex and dynamic social phenomenon that is practised differently by the three groups of key players.

Monarchs across the Pacific: the Columbus hypothesis revisited

The 'Columbus hypothesis' suggests that the annual north-south return migration of Danaus plexippus in North America is a very recently evolved behaviour, less than 200 years old. This hypothesis rests, in part, on an analysis of the 19th century spread of the monarch across the Pacific that assumes a continuous east to west movement and is based predominantly on one publication. We review all the contemporary literature and present new analysis of the data. The movement of the monarch across the Pacific in the second half of the 19th century is best explained by a model which involves no more than three spot introductions, directly or indirectly aided by human movement, followed by natural spread of the monarch across island groups. Contemporary records refer to 'boom' and 'bust' population cycles on newly settled islands, which may have led to high rates of monarch movement. We see no evidence in the records to suggest an east to west sweep by monarch populations as suggested by the Columbus hypothesis. (C) 2004 The Linnean Society of London.

Standing with assistance of a tilt table in intensive care: A survey of Australian physiotherapy practice

Although tilt tables are used by physiotherapists to reintroduce patients to the vertical position, no quantitative evidence is available regarding their use within intensive care units (ICUs) of Australian hospitals. The purpose of this study was to evaluate the use of tilt tables in physiotherapy management of patients in ICUs across Australia. Ninety-nine physiotherapists working in Australian public ICUs were contacted via mail and asked to complete a questionnaire regarding their use of tilt tables in practice. Reasons for the use of the tilt table, contraindications, commonly used adjuncts, monitoring, and outcome measures were also investigated. Eighty-six questionnaires were returned (87% response). The tilt table was used by 58 physiotherapists (67.4%). The most common reasons for inclusion of tilt table treatment were to: facilitate weight bearing (94.8% of those who tilt); prevent muscle contractures (86%); improve lower limb strength (81%); and increase arousal (70%). The tilt table was most frequently applied to patients with neurological conditions (63.8%) and during long-term ICU stay (43.1%). Techniques often combined with tilt table treatment included upper limb exercises (93.1%) and breathing exercises (86.2%). Standing with assistance of the tilt table is used by the majority of physiotherapists working in Australian ICUs. A moderate level of agreement is demonstrated by physiotherapists regarding indications to commence tilt table treatment and adjunct modalities combined with standing with assistance of the tilt table.

Meeting Physical Activity Guidelines and Average Daily Steps in a Working Population

Purpose: The aims of this study were to investigate the relationships and agreement between average number of steps taken per day and compliance with Australian physical activity guidelines in a sample of working Australian adults. Methods: One hundred-eighty-five adults wore a pedometer and recorded the number of steps taken each day for 7 d. On the 8th day, they completed a self-report survey that asked about frequency and duration of different activities during the previous week. Results: The average number of steps per day was 8543 (standard deviation = 2466) for men (n = 74) and 9093 (2926) for women (n = 111; no significant difference). Just over half the men (53%) and 45% of the women met the current national physical activity guidelines (no significant difference). Average number of steps per day was higher in those who met the guidelines [9547 (2655), n = 89] than in those who did not [8220 (2702), n = 96; P

Walking performance, oxygen uptake kinetics and resting muscle pyruvate dehydrogenase complex activity in peripheral arterial disease

In the present study, we tested the hypothesis that walking intolerance in intermittent claudication (IC) is related to both slowed whole body oxygen uptake (Vo(2)) kinetics and altered activity of the active fraction of the pyruvate dehydrogenase complex (PDCa) in skeletal muscle. Ten patients with IC and peripheral arterial disease [ankle/brachial index (ABI) = 0.73 +/- 0.13] and eight healthy controls (ABI = 1. 17 +/- 0.13) completed three maximal walking tests. From these tests, averaged estimates of walking time, peak Vo(2) and the time constant of Vo(2) (tau) during submaximal walking were obtained. A muscle sample was taken from the gastrocnemius medialis muscle at rest and analysed for PDCa and several other biochemical variables. Walking time and peak Vo(2) were approx. 50 % lower in patients with IC than controls, and tau was 2-fold higher (P < 0.05). r was significantly correlated with walking time (r = -0.72) and peak Vo(2) (r = -0.66) in patients with IC, but not in controls. PDCa was not significantly lower in patients with IC than controls; however, PDCa tended to be correlated with tau (r = -0.56, P = 0.09) in patients with IC, but not in controls (r = -0.14). A similar correlation was observed between resting ABI and tau (r = -0.63, P = 0.05) in patients with IC. These data suggest that the impaired Vo(2) kinetics contributes to walking intolerance in IC and that, within a group of patients with IC, differences in Vo(2) kinetics might be partly linked to differences in muscle carbohydrate oxidation.